CN107530948A - The injection moulding mould of injection drawing blow molding machine, the manufacturing process of prefabrication, the manufacturing process and container of prefabrication and container - Google Patents

Abstract

When lifting the core mold at the time of mold opening at the injection molding part of the injection stretch blow molding machine, the stress is not concentrated at the part where the wall thickness of the preform mouth part and the preform body part changes, and the preform The skin layer formed at the part where the wall thickness of the product mouth and the preform main part changes can suppress the joint lifting of the preform main part and improve the productivity of the injection stretch blow molding machine. The aforementioned preform (30) is that the temperature of the skin layer (34) of the surface layer is lower than that of the middle layer (35), and the preform main body (32) and the preform bottom (33) can bulge and deform from the inside of the preform to the outside of the preform, It is characterized in that the skin layer (34) extending from the inner surface of the preform body part (32) to the inner surface of the preform mouth part (31) is the skin layer opposite to the inner surface of the preform body part (32) The extension line (38) towards the top of (34) is outwardly inclined and open on the taper, so that the stress from the preform main body (32) when the mandrel is lifted is formed on the stress dispersion surface ( 39) Disperse on.

Description

Injection molding mold for injection stretch blow molding machine, molding method of preform, prefabrication Product, and container forming method and container

technical field

The present invention relates to an injection mold for an injection stretch blow molding machine, a method for forming a preform, a method for forming a preform, a container, and a container.

Background technique

Conventionally, in the molding of containers, an injection stretch blow molding machine having three stations including an injection molding part, a stretch blow molding part, and an extraction part is used. The injection molding part is connected to an injection device to feed molten resin. The stretch blow molding unit forms the preform formed by the injection molding unit into a container, and the take-out unit carries out the container formed by the stretch blow molding unit to the outside of the machine.

Furthermore, there is a molding machine having the following structure: on the injection stretch blow molding machine, three stations are positioned on the same circumference, arranged at equal angles, and a rotating plate portion provided with a rotating plate is arranged, and the rotating plate portion The molded preforms and containers are transported to three stations in such a way that they rotate and move.

The rotary plate of the injection stretch blow molding machine has a lip mold on the lower surface. The lip mold forms the outer peripheral surface of the mouth of the preform, and carries out the conveyance of the preform and the mouth of the preform to be formed. For the transportation of the formed container, the aforementioned lip mold is used both for the formation of the outer peripheral surface of the mouth of the preform and for the transportation of the preform.

In addition, around the central axis of rotation of the rotary plate, as described above, the injection molding part, the stretch blow molding part, and the extraction part are arranged at equal angles (120 degrees) around the central axis of rotation, and the rotary plate rotates constantly every time it rotates. After the angle (120 degrees), it stops and the rotating plate part descends. Each time the rotating plate part is lowered, the lip mold on the lower surface of the rotating plate corresponds to the injection molding part, the stretch blow molding part, and the extraction part. In the stretch blow molding section, the lip mold is lowered to form a stretch blow molding mold.

The injection molding mold at the injection molding section is, for example, a combination of a lip mold, a cavity mold, and a core mold. The lip mold is lowered as shown in Patent Document 1. The cavity mold is fixed at the injection molding section. The parts can be raised and lowered. And, by the lowering of the above-mentioned rotary plate part, the lip mold overlaps with the cavity mold fixed to the injection molding part, and the core mold installed in the injection molding part so as to be able to move up and down enters the inner side of the cavity mold through the lip mold, and the molds are closed. To form the preform forming space surrounded by the aforementioned lip mold, cavity mold and core mold.

The resin injected from the injection device is fed into the above-mentioned preform forming space and filled to form a preform. Then, after about a few seconds from the injection of the resin, the core die rises, and the lip die rises (the rotating plate portion rises) to open the mold (mold release), and the preform to be molded moves to the upper part of the injection molding part together with the lip die.

As a part of the injection molding die, the lip mold forms the shape of the outer peripheral surface of the mouth of the preform, holds and transports the preform to be formed, and also plays the role of shaping the stretch blow molding part in the next forming stage. The container is held and transported to the take-out section. With the lip mold at the positions corresponding to the above three stations, the rotary plate of the rotary plate section rotates at a constant rotation angle and then stops, and the rotary plate section goes up and down, whereby the preform conveyed from the injection molding section via the lip mold It is sent to the stretch blow molding section, and is stretch blow molded to form a container. In addition, the container stretch blow molded by the stretch blow molding section is sent to the take-out section by the lip mold that holds the mouth of the container. For conveyance, the holding of the lip mold relative to the mouth of the container is released by the take-out part, and the formed container is sent out of the machine.

Patent Document 1: Japanese Patent Application Laid-Open No. 11-188779.

In the conventional injection molding mold composed of the injection molding section of the above-mentioned injection stretch blow molding machine, the preform forming space is composed of a preform mouth forming section, a preform main body forming section, and a preform bottom forming section. The preform main body forming part is continuous with the preform mouth forming part, and the gap width is formed to be wider than the gap width of the preform mouth forming part to form a uniform gap width. The preform bottom forming part and the preform main body forming part Continuous, the lower end is the gate (ゲート) side of the resin inlet.

The preform main body and the preform bottom of the preform are expanded by stretch blow molding, so a large amount of resin is required, and the gap width of the preform main body forming part and the preform bottom forming part in the preform forming space It is wider than the gap width of the above-mentioned preform mouth portion forming portion in the preform forming space portion. On the other hand, the shape of the preform mouth and the container mouth does not change, so the gap width of the preform mouth forming part in the preform forming space is wider than the gap width of the preform body part forming part and the preform bottom forming part. narrow.

In addition, there are cases where an outwardly protruding screw forming part, a flange forming part, etc. are provided on the preform mouth forming part, but in this case, the preform mouth forming part itself does not change, and the gap The width is narrow.

As described above, the gap width of the preform body portion forming portion continuous to the preform mouth portion forming portion is wider than the gap width of the preform mouth portion forming portion in the preform forming space. In the forming part, the gap width is narrowed at a portion close to the preform mouth forming part. Specifically, as shown in Patent Document 1, the position near the inner surface forming portion of the preform body portion of the mandrel and the inner surface forming portion of the preform mouth portion of the mandrel is formed in a tapered shape.

However, when it is desired to improve the molding efficiency by means of an injection stretch blow molding machine having an injection molding mold with the above-mentioned structure, it is necessary to shorten the molding cycle of the preform at the injection molding part, and to study the timing of mold opening, that is, to study the core The timing of the mold is brought forward.

In the preform formed by forming a space-filling resin for the above-mentioned preform of the injection molding mold, the surface layer that is in contact with the injection molding mold (lip mold, cavity mold, core mold) is compared with the middle layer that is not in contact with the injection molding mold The skin layer whose hardness increases as the temperature drops is also formed on the surface layer that is in contact with the above-mentioned tapered portion of the inner surface forming portion of the preform mouth portion of the mandrel.

And, in the case of lifting the mandrel at the conventional timing, the preform main body corresponding to the preform main body inner surface forming part of the mandrel is jointly lifted, and the preform corresponding to the above-mentioned tapered part of the mandrel is stressed. Concentrated, but the skin layer formed by the aforementioned tapered portion resists the stress and suppresses the joint lifting of the preform main body.

However, when the mandrel is lifted up early, the skin layer formed by the tapered portion tends to become insufficiently hard. of stress, the epidermis of the cone-shaped part collapses. As a result, disadvantages occur that the preform main body is lifted up, the preform main body collides with the preform mouth, the overall shape of the preform collapses, and the preform cannot be used in the next molding stage of stretch blow molding. Therefore, it is in a situation where the timing of mold opening cannot be advanced and the molding efficiency cannot be improved.

Contents of the invention

Therefore, the present invention, in view of the above-mentioned circumstances, has a problem that, in the injection molding mold constituted by the injection molding section of the injection stretch blow molding machine, when the core mold is lifted at the time of mold opening, the preform mouth and the preform The part where the wall thickness of the main part of the product changes can disperse the stress without concentration, and the skin layer formed at this part can suppress the joint lifting of the main part of the preform. The object of the present invention is to make the injection stretch blow molding machine Productivity increases.

(invention of technical scheme 1)

The present invention is made in consideration of the above problems, and provides an injection molding die for an injection stretch blow molding machine to solve the above problems. The lower part of the rotating plate to stop and lift is provided with an injection molding part, a stretch blow molding part, and an extraction part around the rotation center axis of the rotating plate. Forming the outer peripheral surface of the product mouth and conveying the preform, the plate is lowered every time it rotates, the lip mold corresponds to the injection molding part, the stretch blow molding part, and the extraction part, and the cavity mold and the core mold are arranged on the injection molding part , the aforementioned core mold can be raised and lowered in a manner capable of entering the cavity mold, and is arranged to be able to enter the core mold of the cavity mold through the aforementioned lip mold at a position corresponding to the injection molding part, the aforementioned cavity mold, and the lip mold, Forming an injection molding mold, it is characterized in that the injection molding mold has a preform forming space surrounded by a lip mold, a cavity mold, and a core mold, and the aforementioned preform forming space is composed of a preform mouth forming part, a preform body part forming part, a preform forming part, and a preform forming part. The product bottom forming portion is constituted, the preform main body forming portion is continuous with the preform mouth forming portion, the gap width is set to be uniform, the gap width is wider than the gap width of the preform mouth forming portion, and the preform bottom The forming part is continuous with the forming part of the preform body part, and the lower end is on the side of the gate. The aforementioned preform mouth inner surface forming portion corresponds to the aforementioned preform mouth forming portion, the aforementioned preform body portion inner surface forming portion corresponds to the aforementioned preform body portion forming portion, and the aforementioned preform bottom inner surface forming portion corresponds to the aforementioned preform body portion forming portion. Corresponding to the bottom forming part, the diameter expanding part gradually expands the diameter of the mandrel from the inner surface forming part of the preform main body part to the inner surface forming part of the preform mouth part. The inner surface forming portion of the preform main body portion is tapered outwardly from the position along the extension line of the outer peripheral surface of the mandrel toward the upper side. The part that is continuous to the part where the inner surface of the mouth of the preform is formed is opposite to the lip die.

(invention of technical scheme 2)

In the present invention, it is preferable that the outer peripheral surface of the mandrel of the diameter-enlarging portion intersects the upper end position of the preform mouth portion forming portion with an extension line of the diameter-enlarging portion directed upward along the outer peripheral surface of the mandrel. way slanted.

(Invention of Claim 3)

In addition, in the present invention, it is preferable that the diameter-expanding portion is provided so that it passes through the parting line between the cavity mold and the lip mold from a portion of the inner surface forming portion of the preform main body portion that is opposed to the cavity mold. The height position extends to a portion of the preform mouth inner surface forming portion facing the lip die.

(Invention of Claim 4)

In addition, in the present invention, it is preferable that a cylindrical portion that decreases in diameter downward is provided between the preform body portion forming portion and the preform bottom portion forming portion, and that the cylindrical portion is directed toward the cylindrical portion. A tangent to the lower side in the up-down direction of the portion is tapered toward the centerline of the preform forming space relative to an extension line toward the lower side of the preform main body portion forming portion.

(Invention of Claim 5)

Also, an invention is a method of molding a preform, which is provided to solve the above-mentioned problems, wherein the resin is injected into the injection molding die of the above-mentioned injection stretch blow molding machine, and by contact with the injection molding die The cooling is carried out to form a preform in the state where the surface layer of the resin filled in the preform forming space has a skin layer with a lower temperature than the middle layer of the filled resin, and the mold is opened, and the lip mold is kept in the above-mentioned state. The preform in which the temperature of the skin layer is lower than that of the middle layer is conveyed from the injection molding part to the stretch blow molding part, and it is characterized in that at a corresponding part of the filled resin corresponding to the enlarged diameter part of the core mold The skin layer, which is in contact with the diameter-enlarged portion and has a temperature lower than that of the middle layer, forms a stress-dispersing surface portion in which the diameter expands upward in a tapered shape.

(Invention of Claim 6)

In addition, in the above invention, it is preferable that the stress dispersing surface is formed so as to be continuous from the preform main body part forming part on the mandrel side of the preform forming space to the preform mouth part forming part on the mandrel side. .

(Invention of Claim 7)

In addition, in the above invention, it is preferable that the stress distributing surface prevents the resin filled in the preform main body portion forming portion from moving upward along with the core mold raised by mold opening.

(Description of Technical Solution 8)

In addition, another invention is a preform, which is provided to solve the above-mentioned problems, the aforementioned preform is composed of a preform mouth, a preform main body, and a preform bottom, the aforementioned preform has a bottom, and the aforementioned preform main body It is continuous with the mouth of the preform and thicker than the mouth of the preform. The bottom of the preform is continuous with the main body of the preform. The skin layer of the surface layer is lower in temperature than the middle layer of the preform. The bottom of the preform can bulge and deform from the inside of the preform to the outside of the preform, and it is characterized in that the skin layer extending from the inner surface of the preform main body to the inner surface of the preform mouth is opposite to the surface facing the preform main body. The extension line above the epidermis on the inner surface is tapered outwards obliquely.

(Invention of Claim 9)

In addition, another invention is a method for forming a container. The method for forming a container is provided to solve the above-mentioned problems. The container is formed by means of an injection stretch blow molding machine. Underneath the rotating plate portion that stops at a constant rotation angle to lift up and down, an injection molding portion, a stretch blow molding portion, and an extraction portion are provided around the rotation center axis of the rotating plate. The rotating plate has a lip mold on the lower surface, and the lip The mold is also used for forming the outer peripheral surface of the preform mouth and conveying the preform. The plate is lowered every time it is rotated. The lip mold corresponds to the injection molding part, the stretch blow molding part, and the extraction part. A cavity is arranged on the injection molding part. A mold and a core mold, the aforementioned core mold can be raised and lowered in a manner that can enter the cavity mold, and it is arranged to be able to enter the cavity mold through the aforementioned lip mold and the aforementioned cavity mold at a position corresponding to the injection molding part The mandrel mold forms an injection molding mold, and a blow mold, a stretch rod, and a blowing gas supply mechanism are arranged on the stretch blow molding part, and the stretch rod enters the blow mold to elongate. The blowing gas supply mechanism sends blowing gas into the aforementioned blow mold, and can pass through the aforementioned lip mold through the lip mold located at a position corresponding to the stretch blow molding part to enter the blow mold. The above-mentioned stretching rod of the mold and the above-mentioned blowing gas supply mechanism form a blow molding mold, and on the above-mentioned take-out part, a molded product receiving port is formed below the above-mentioned lip die at a position corresponding to the take-out part. At this time, The above-mentioned injection molding mold has a preform forming space surrounded by a lip mold, a cavity mold, and a core mold. The preform main body forming part is continuous with the preform mouth forming part, and the gap width is set to be uniform, and the gap width is wider than the gap width of the preform mouth forming part, and the preform bottom forming part and the preform body The part forming part is continuous, and the lower end is the gate side. The aforementioned mandrel has a preform mouth part inner surface forming part, a preform body part inner surface forming part, a preform bottom inner surface forming part, and has an enlarged diameter part. The surface forming portion corresponds to the preform mouth forming portion, the preform main body inner surface forming portion corresponds to the preform main body forming portion, the preform bottom inner surface forming portion corresponds to the preform bottom forming portion, and the expansion The diameter part gradually expands the diameter of the mandrel from the inner surface forming part of the preform main body part to the inner surface forming part of the preform mouth part. The position along the extension line of the outer peripheral surface of the mandrel toward the upper side is tapered outwardly, and the outer peripheral surface of the mandrel of the enlarged diameter part is continuous from the inner surface forming part of the preform main body part to the inner surface of the preform mouth part. In the part of the forming part that is opposite to the lip mold, resin is injected into the injection molding mold, and the surface layer of the resin filled in the preform forming space is molded with a ratio formed by cooling due to contact with the injection molding mold. The middle temperature of the filled resin is lower than the skin layer The lip mold holds the preform in a state in which the temperature of the skin layer is lower than that of the middle layer, and is transported from the injection molding part to the stretch blow molding part, and is held by the lip mold The preform transferred to the stretch blow molding unit is molded into a container by the blow molding unit, and the lip mold holds the molded container, and is transported from the stretch blow molding unit to the take-out unit, and held by the lip mold. And when the container conveyed to the take-out section corresponds to the above-mentioned molded product receiving port, the holding state of the lip mold relative to the container is released.

(Invention of Claim 10)

In addition, in the above invention, it is preferable that the core mold outer peripheral surface of the above-mentioned enlarged diameter portion of the core mold is connected to the above-mentioned preform mouth portion forming portion by an extension line of the expanded diameter portion toward the upper side along the core mold outer peripheral surface. The upper end position is inclined in a way of crossing.

(Invention of Claim 11)

In addition, in the above invention, it is preferable that the diameter-enlarging portion of the mandrel is provided so that it passes through the separation of the cavity mold and the lip mold from a portion of the inner surface forming portion of the preform main body portion that is opposed to the cavity mold. The height position of the molding line extends to a portion of the preform mouth inner surface forming portion facing the lip die.

(Invention of Claim 12)

In addition, in the above invention, it is preferable that a cylindrical portion whose diameter decreases downward is provided between the preform main body portion forming portion and the preform bottom portion forming portion of the injection molding mold, and the cylindrical portion is A tangent to the downward side in the vertical direction of the tubular portion is tapered to a centerline of the preform forming space relative to an extension line to the downward side of the preform main body portion forming portion.

(Invention of Claim 13)

Furthermore, another invention is a container obtained by the above-mentioned method of forming a container, and the container is provided to solve the above-mentioned problems.

The effect of the invention

According to the present invention, the bottomed preform is composed of a preform mouth, a preform main body, and a preform bottom. The preform main body is continuous with the preform mouth and has a thicker wall than the preform mouth. The bottom of the product is continuous with the main body of the preform, and the temperature of the skin layer of the surface layer of the preform is lower than that of the middle layer, wherein, the skin layer extending from the inner surface of the main body of the preform to the inner surface of the mouth of the preform is, relative to The tapered shape is inclined outward toward the extension line above the skin layer of the inner surface of the preform main body.

Thus, when the preform is molded at the injection molding section of the injection stretch blow molding machine, on the inner surface side of the portion where the wall thickness of the preform mouth and the preform main body changes, from the preform mouth The height position of the inner surface in the region extends to the height position of the inner surface in the region of the preform main body. A wide skin layer is formed in the vertical direction of the preform. Even if the core mold is lifted, the main body of the preform is lifted , and also prevent the stress from the side of the main body of the preform from dispersing and locally concentrating in the wide tapered skin layer.

Therefore, even if the body portion of the preform is lifted up, the skin layer extending from the height position of the inner surface in the mouth region of the preform to the height position of the inner surface in the body portion region of the preform prevents the joint lifting. Thereby, it is possible to bring up the timing of the core mold earlier, and it is possible to shorten the molding time of the preform, and it has an excellent effect of being able to convey the preform to the next stage of stretch blow molding.

Description of drawings

Fig. 1 shows an injection stretch blow molding machine embodying the present invention, (a) is an explanatory diagram showing the state of the injection molding part viewed from the front, (b) is an explanatory diagram showing the state of the injection molding part viewed from the side, ( c) is an explanatory diagram showing the arrangement of an injection molding unit, a stretch blow molding unit, and an extraction unit.

Fig. 2 shows the operation of the injection molding part of the present invention, (a) is an explanatory diagram showing a state where a lip mold and a cavity mold correspond, and (b) is an explanatory diagram showing a state where a mold is closed.

Fig. 3 is an explanatory diagram showing a blow mold in a stretch blow molding section of the present invention.

Fig. 4 is an explanatory view showing stretch blow molding of the stretch blow mold of the present invention.

Fig. 5 is an explanatory view schematically showing an injection molding die of the present invention.

Fig. 6 is an explanatory view showing an example of a preform molded in the injection molding unit of the present invention.

Fig. 7 is an explanatory view showing the shape of a conventional preform for comparison.

Fig. 8 is an explanatory view showing an example of deformation of the injection molding die of the present invention.

Fig. 9 is an explanatory diagram schematically showing an injection mold according to another embodiment of the present invention.

Fig. 10 is an explanatory view showing the shape of a preform according to another example of the present invention.

11 shows a sample container, (a) is an explanatory diagram showing a state viewed from above, (b) is an explanatory diagram showing a state viewed from the front, and (c) is an explanatory diagram showing a state viewed from below, (d) is explanatory drawing which shows the state seen from the side.

detailed description

(Injection Stretch Blow Molding Machine)

Next, the present invention will be described in detail based on the embodiments shown in FIGS. 1 to 11 . 1 in the figure is an injection stretch blow molding machine. As shown in FIG. These three stations are provided with a rotating plate portion 5 that can be raised and lowered in the vertical direction at a position above the three stations.

The above-mentioned injection molding part 2, stretch blow molding part 3, and extraction part 4 are arranged on the same circumference at intervals of equal angles (120 degrees) around the circumference. In addition, the above-mentioned rotating plate part 5 is such that the rotating plate 7 having the lip mold 6 which is used both for forming the outer peripheral surface of the preform mouth part and for conveying the preform is installed on the lower surface so that it can pass through the center of the arrangement of the above-mentioned stations. The center of the rotation axis rotates, and every time the rotation stops at an equal rotation angle (120 degrees), each time it stops, the aforementioned lip mold 6 is located corresponding to the injection molding part 2, the stretch blow molding part 3, and the extraction part 4 s position.

And, if the rotary plate 7 temporarily stops as described above, and the rotary plate part 5 descends, then on the above-mentioned injection molding part 2, the cavity mold 8 fixed to the position of the injection molding part 2 as shown in FIG. The lip mold 6 and the core mold 9 passing through the lip mold 6 and entering the cavity mold 8 through the injection molding part 2 can be raised and lowered to form an injection molding mold 10 .

In addition, in the above stretch blow molding section 3, as a pair of half mold blow molds 11 and the aforementioned lip mold 6 as shown in FIG. Molding12. And, as shown in FIG. 4 , in the stretch blow molding section 3 , the stretching operation in which the stretch rod 13 enters the blow mold 11 and the stretch blow molding by blowing the blowing gas 14 from the blowing gas supply mechanism are performed. take shape.

In addition, in the above-mentioned take-out part 4, a molded product receiving port 15 is formed below the lip die 6 at a position corresponding to the take-out part 4, and the holding of the lip die 6 relative to the molded product is released, whereby the molded product is released to the machine. take out.

In this way, in the injection stretch blow molding machine 1 including the injection molding part 2, the stretch blow molding part 3, the extraction part 4, and the rotating plate part 5, the lip mold 6 arranged in the injection molding part 2 is formed The injection mold 10 is fed with the resin injected by the injection device to form a preform. The molded preform is conveyed to the stretch blow molding unit 3 by the lifting of the rotary plate portion 5 after mold opening, the upward movement of the lip mold 6 by the rotation of the rotary plate 7 , and the rotational movement. In the stretch-blow molding section 3, the preform is stretch-blow-molded to form a container. Furthermore, by conveying the lip mold 6, the above-mentioned formed container is transferred from the stretch blow molding section 3 to the take-out section 4, and the holding of the lip mold 6 relative to the container is released at the take-out section 4, and the container as a molded product is released to the container. sent out of the machine.

(preform forming space)

FIG. 5 shows the injection mold 10 of the injection molding unit 2, which is composed of the lip mold 6, the cavity mold 8, and the core mold 9 as described above. The injection molding die 10 is a die for molding a preform of a plastic bottle-type container whose final shape is a container body having a larger diameter than the container mouth. Therefore, the lip die 6 is equipped with the recessed part 16 for thread formation, and the recessed part 17 for flange formation.

As shown in FIG. 5 , the preform forming space 18 is surrounded by the lip mold 6 , the cavity mold 8 , and the core mold 9 of the injection molding mold 10 . The preform forming space 18 is composed of a preform mouth forming part 19, a preform main body forming part 20, and a preform bottom forming part 21. The preform main body forming part 20 is continuous with the preform mouth forming part 19, and the gap The width is set to be consistent, the gap width is wider than the gap width of the preform mouth portion forming portion 19, the preform bottom portion forming portion 21 is continuous with the preform body portion forming portion 20, the lower end is the gate side, and the molten state Resin can be fed into the preform forming space 18 from the injection device.

(core mold)

Furthermore, the above-mentioned core mold 6 is designed so that the above-mentioned collapse of the preform formed in the above-mentioned preform forming space 18 does not occur at the time of mold opening (mold release). The core mold 6 is composed of a preform mouth inner surface forming portion 22 , a preform main body inner surface forming portion 23 , and a preform bottom inner surface forming portion 24 .

The above-mentioned preform mouth inner surface forming part 22 is a part corresponding to the above-mentioned preform mouth part forming part 19, the preform main body part inner surface forming part 23 is a part corresponding to the above-mentioned preform main body part forming part 20, and the preform bottom inner surface The forming part 24 is a part corresponding to the above-mentioned preform bottom forming part 21 .

Furthermore, at the mandrel 6, there is provided a diameter-enlarging portion 25, which is enlarged in comparison with the degree of diameter-enlarging of the inner surface forming portion 23 of the preform main body portion (the degree in which the diameter of the mandrel gradually increases toward the upper side of the mandrel). The diameter of the mandrel is slightly enlarged, and the diameter of the mandrel is gradually enlarged. As shown in the figure, the aforementioned enlarged diameter portion 25 is provided from the inner surface forming portion 23 of the preform main body to the inner surface forming portion 22 of the preform mouth.

(expansion part)

The enlarged diameter part 25 slightly increases the degree of diameter expansion of the mandrel diameter compared with the degree of diameter expansion toward the upper side of the mandrel of the preform main body inner surface forming part 23 as described above, so the outer periphery of the mandrel of the enlarged diameter part 25 The surface 26 has a tapered shape inclined outward from the position of the preform main body inner surface forming portion 23 along the upward extension line 28 of the mandrel outer peripheral surface 27 .

Furthermore, the above-mentioned mandrel outer peripheral surface 26 is provided so as to extend from the preform main body inner surface forming portion 23 to the preform mouth inner surface forming portion 22, but in particular, between the aforementioned preform mouth inner surface forming portion 22 and the lip mold 6 Continuous in relative range. Further, an upward extension line 28 along the mandrel outer peripheral surface 26 is formed to intersect the upper end position 19 a of the above-mentioned preform mouth forming portion 19 in the preform forming space 18 .

In order to make the core mold outer peripheral surface 26 of the above-mentioned enlarged diameter portion 25 of the core mold 6 continue from the preform body part inner surface forming part 23 to the part of the preform mouth part inner surface forming part 22 opposite to the lip mold 6 as described above, In this embodiment, the enlarged diameter portion 25 is arranged as follows.

That is, the enlarged diameter portion 25 is provided so as to extend from the portion of the inner surface forming portion 23 of the preform main body portion facing the cavity mold 8 through the height position 29 of the parting line between the cavity mold 8 and the lip mold 6 to the preform mouth. The inner surface of the portion forms the portion of the portion 22 opposite to the lip die 6 . By arranging the enlarged diameter portion 25 in this way, the tapered core mold outer peripheral surface 26 provided with the enlarged diameter portion 25 is formed to be wider in the vertical direction of the core mold.

(shaping of preforms)

In the above-mentioned injection stretch blow molding machine 1, resin is injected from the injection device into the above-mentioned injection molding mold 10 constituted by the injection molding part 2, and is sent into the above-mentioned preform forming space 18 of the injection molding mold 10, whereby the resin is molded. In the preform, the middle layer of the filled resin has a higher temperature, while the skin layer has a lower temperature and increased hardness due to the contact between the surface layer and the surrounding injection mold. The molding of the preform is performed in about a few seconds, the mold is opened, and the preform is conveyed to the next stretch blow molding unit 3 via the lip die 6 to obtain a preform capable of stretch blow molding.

(prefabricated)

FIG. 6 shows a preform 30 molded by the injection molding die 10 described above. The preform 30 is a bottomed preform composed of a preform mouth 31 , a preform main body 32 continuous with the preform mouth 31 , and a preform bottom 33 continuous with the preform main body 32 . And, the temperature of the skin layer 34 of the surface layer is lower than that of the middle layer 35, so that the shape of the plastic bottle as the final shape is obtained by stretch blow molding at the stretch blow molding part 3, the preform main body part 32 and the preform bottom part 33 can bulge and deform from the inside of the preform toward the outside of the preform.

In addition, on the outer peripheral surface of the preform mouth portion 31 , corresponding to the above-mentioned recessed portion 16 for forming the thread and recessed portion 17 for forming the flange of the lip die 6 , a threaded portion 36 and a flange portion 37 are integrally formed.

A portion corresponding to the enlarged diameter portion 25 of the mandrel 9 exists in the skin layer 34 inside the preform 30 . That is, the skin layer 34 extending from the inner surface of the preform main body part 32 to the inner surface of the preform mouth part 31 is the preform main body from the core mold 9 side of the preform forming space 18 when the preform is formed. The part forming part 20 is continuously formed over the part of the preform mouth part forming part 19 on the side of the mandrel 9, whereby this part is formed in contact with the mandrel outer peripheral surface 26 of the enlarged diameter part 25 of the mandrel 6. part.

(stress dispersing face)

And, the skin layer 34 formed in contact with the core mold outer peripheral surface 26 of the enlarged diameter portion 25 is inclined outward with respect to the extension line 38 above the skin layer 34 facing the inner surface of the preform main body portion 32 in a tapered upward direction. In the open shape, the skin layer 34 formed in contact with the outer peripheral surface 26 of the core mold of the enlarged diameter portion 25 serves as the stress dissipating surface portion 39 .

The stress distributing surface 39 composed of the skin layer 34 functions to prevent the shape of the preform from collapsing when the mold is opened, and is a core mold 6 that suppresses the resin filled in the main body portion forming portion of the preform from rising as it passes through the mold opening. The part that moves up.

In this way, in the preform forming space 18 of the injection molding mold 10, the temperature of the skin layer 34 is lower than that of the middle layer 35, and the preform 30 is molded in a state in which the hardness of the resin in the middle layer 35 is increased compared with that of the fluid state. The above-mentioned stress distributing surface 39 on the inner surface is a part in a state where the hardness is increased. Similarly, the stress distributing surface 39 is continuous with the skin layer 34 inside the mouth portion 31 of the preform and the skin layer inside the main body portion 32 of the preform. 34 is also in a state of hard increase.

In the injection stretch blow molding machine 1, when the above-mentioned preform 30 is obtained, the core mold 6 is lifted by mold opening. The product main body 32 is lifted up together, and the pushing-up pressure from the side of the preform main body 32 is transmitted to the above-mentioned stress dispersing surface 39 .

As described above, the core mold outer peripheral surface 26 of the enlarged diameter portion 25 is formed wide in the vertical direction of the core mold, and the extension line 28 of the core mold outer peripheral surface 26 intersects the upper end position 19a of the preform mouth portion forming portion 19, Therefore, the above-mentioned stress dispersing surface 39 is also formed to be wider in the vertical direction of the preform 30, and the inclination of the stress dispersing surface 39 is also in the same way as the extension line 40 of the stress dispersing surface 39 toward the upper side and the upper part of the preform mouth 31. The positions of the end faces 41 are inclined so as to cross each other.

When the above-mentioned pushing-up pressure from the side of the preform main body 32 is transmitted to the stress dispersing surface 39 , stress as a resistance is generated on the stress dispersing surface 39 , but it is dispersed over a wide stress dispersing surface 39 without being localized. . Furthermore, since the stress distributing surface 39 is very slightly inclined with respect to the joint lifting direction of the preform main body (the core lifting direction), stress is appropriately transmitted to the skin layer 34 on the inner surface of the preform mouth 31 . The preform mouth 31 itself is thin-walled, so the ratio of the skin layer 34 is formed relative to the thickness of the preform mouth 31 (the thickness of the skin layer is relatively thick relative to the thickness direction of the preform mouth), As a result, the rigidity of the preform mouth portion 31 as a whole is improved, and the pressure from the stress distributing surface portion 39 side is reliably supported. In addition, in FIG. 6 , the direction of the pressure on the skin layer 34 is indicated by arrows.

Thereby, when the core mold 9 is lifted, the stress distributing surface portion 39 does not collapse, and the joint lifting of the preform main body portion 32 is reliably suppressed, and the preform 30 is properly formed without causing the preform 30 to collapse in shape. Mold opening has the effect of being able to advance the timing of pulling up the core mold.

After molding the preform 30 in the injection stretch blow molding machine 1 as described above, stretch blow molding is performed by the stretch blow molding unit 3, and the plastic bottle obtained by the stretch blow molding The container is sent out of the machine by the take-out part 4, and the container is formed.

(Compared)

FIG. 7 shows a conventional preform 30 for comparison. In addition, the reference numerals representing the same parts are made the same to facilitate description. In this conventional preform 30 molded by the injection molding part of the injection stretch blow molding machine, in order to absorb the difference in the wall thickness of the preform mouth part 31 and the wall thickness of the preform main part 32, the preform main part 32 has a stepped portion 42 on the inner surface on the side of the preform mouth portion 31 .

In addition, the entire stepped portion 42 is formed within a range corresponding to the cavity mold 8, and the inclination of the inner peripheral surface of the stepped portion 42 is such that an extension line extending upward along the inner peripheral surface is aligned with the preform mouth portion 31. The way the base crosses is oblique.

In the preform molding of this conventional shape, it has been confirmed that when the mandrel is lifted at the timing at which the preform of the present invention can be obtained, the pressure at the step portion 42 is reduced due to the pressure of the preform main body part being lifted up. The skin layer collapses, which also causes a collapse of the main body of the preform.

In addition, it has also been confirmed that the time from resin feeding (at the time of injection) to lifting (mold opening) of the core mold in the conventional preform molding as a comparison and the time from resin feeding in the above-mentioned preform molding of the present invention have been confirmed. Comparing the time from (injection) to lifting (mold opening) of the core mold, the time can be shortened by about 20%.

(Example of design for resin feed)

Fig. 8 shows an example in which the shape of the preform forming space is designed so that it is easier to fill the preform forming space of the injection molding mold with resin when molding the preform of the present invention.

In this modified example, in the preform forming space 18 , a cylindrical portion 43 whose diameter decreases downward is provided between the preform body portion forming portion 20 and the preform bottom portion forming portion 21 . In addition, the cylindrical portion 43 is a centerline 18a of the preform forming space from a tangent 44 directed downward in the vertical direction of the cylindrical portion 43 to an extension line 45 directed downward of the preform main body portion forming portion 20 . Slanted way, set into a cone shape.

With such an arrangement, when the resin is fed from the gate side, the resistance when moving from the preform bottom forming portion 21 to the preform main body portion forming portion 20 is reduced, and the filling of the resin enters more smoothly. This point also advances the timing of lifting the mandrel, and good results can be obtained.

(example of the molding of the jar type)

In the above-mentioned examples, the molding of the preform in which the final molded product obtained is a plastic bottle-type molded product having a larger body diameter than the mouth diameter has been described, but the present invention is not limited to the above-mentioned examples. Fig. 9 shows an example of molding of a preform in which the jar is the final molded product. The jar itself of the final molded product is a type of jar with a cap body covering the mouth, and has a fitting protrusion forming recess 46 on the outer peripheral surface side of the mouth molding portion of the preform. In addition, the same code|symbol is attached|subjected to the same type part as the example demonstrated previously, and the description is abbreviate|omitted.

Also in this example, the final molded product is sent out of the machine through the stages of preform molding and stretch blow molding performed by the above-mentioned injection stretch blow molding machine 1 as in the above-mentioned examples, and a wide-mouth bottle is obtained. . In addition, in the lip mold 6 , the cavity mold 8 , and the core mold 9 constituting the preform forming space 18 , an enlarged diameter portion 25 is provided on the core mold 9 .

(expansion part)

The diameter-enlarging portion 25 slightly increases the degree of diameter-expansion of the mandrel diameter compared to the degree of diameter-expansion of the preform main body inner surface forming portion 23 toward the upper side of the mandrel. In addition, the mandrel outer peripheral surface 26 of the enlarged diameter portion 25 is tapered outwardly from the position along the upward extension line 28 of the mandrel outer peripheral surface 27 of the preform main body inner surface forming portion 23 .

The core mold outer peripheral surface 26 is continuous from the preform main body inner surface forming portion 23 to the range facing the lip mold 6 of the preform mouth inner surface forming portion 22 . Further, an extension line 28 extending upward along the core mold outer peripheral surface 26 intersects with an upper end position 19 a of the preform mouth portion forming portion 19 .

In order to make the core mold outer peripheral surface 26 of the above-mentioned enlarged diameter part 25 continue from the preform body part inner surface forming part 23 to the part of the preform mouth part inner surface forming part 22 opposite to the lip mold 6, in this embodiment, the diameter expanding part 25 is also arranged so that, from the part opposite to the cavity mold 8 of the inner surface forming part 23 of the preform body part, through the height position 29 of the parting line of the cavity mold 8 and the lip mold 6, it extends to the inner surface forming part of the mouth part of the preform. The part of 22 that is opposite to the lip mold 6. With this arrangement, the tapered mandrel outer peripheral surface 26 provided as the enlarged diameter portion 25 is formed to be wider in the vertical direction of the mandrel.

(prefabricated)

FIG. 10 shows a preform 30 molded by the injection molding die 10 in another example described above. This preform 30 is also set such that the skin layer 34 of the surface layer is lower in temperature than the middle layer 35, and the shape of the jar as the final shape is obtained by stretch blow molding at the stretch blow molding part 3. The portion 32 and the preform bottom 33 can bulge and deform from the inside of the preform to the outside of the preform.

The skin layer 34 extending from the inner surface of the preform body part 32 to the inner surface of the preform mouth part 31 is formed from the preform body part of the preform forming space 18 on the side of the mandrel 9 when the preform is formed. The portion 20 is formed continuously to the preform mouth portion forming portion 19 on the core mold 9 side, and this portion is formed in contact with the core mold outer peripheral surface 26 of the enlarged diameter portion 25 of the core mold 6 .

(stress dispersing face)

The skin layer 34 formed in contact with the outer peripheral surface 26 of the mandrel of the enlarged diameter portion 25 is tapered outwardly with respect to the upward extension line 38 of the skin layer 34 on the inner surface of the preform main body portion 32 . Like the above-mentioned embodiment, the skin layer 34 formed by the outer peripheral surface 26 of the mandrel is used as the stress dissipating surface 39 .

In the preform 30 formed in the preform forming space 18, the above-mentioned stress distributing surface 39 on the inner surface is in a state of increased rigidity, and the skin layer 34 inside the preform mouth 31 and the surface inside the preform main body 32 are hardened. The cortex 34 is also in a state of increased rigidity.

When the inner surface forming part 23 of the preform body part of the core mold 6 rises due to mold opening, the preform body part 32 of the preform 30 is lifted up together, and the pressure from the preform body part 32 side is transmitted to the above-mentioned stress distribution. Facial39.

The mandrel outer peripheral surface 26 of the enlarged diameter portion 25 is formed wide in the vertical direction of the mandrel, and the extension line 28 of the mandrel outer peripheral surface 26 intersects the upper end position 19a of the preform mouth portion forming portion 19, so the stress is dispersed. The surface 39 also becomes wider in the vertical direction of the preform 30 , and the inclination of the stress dispersing surface 39 is also such that an extension line 40 along the upward direction of the stress dispersing surface 39 intersects with the upper end surface 41 of the preform mouth 31 . way tilted.

When the push-up pressure from the preform main body 32 side is transmitted to the stress dispersing surface 39 , a stress acting as a resistance is generated on the stress dispersing surface 39 , but it is dispersed over a wide stress dispersing surface 39 and does not concentrate locally. Furthermore, the stress distributing surface portion 39 is very slightly inclined with respect to the direction in which the preform body portion is pulled up, and appropriately transmits stress to the skin layer 34 on the inner surface of the preform mouth portion 31 . The preform mouth 31 itself is thin, so the ratio of the skin layer 34 is formed relative to the thickness of the preform mouth 31 (the thickness occupied by the skin layer becomes thicker with respect to the thickness direction of the preform mouth) , as in the above-mentioned embodiment, the pressure from the stress distributing surface 39 side is surely supported. In FIG. 10 , the direction of the pressure at the skin layer 34 is indicated by an arrow.

In this example, when the core mold 9 is lifted up, the stress distributing surface 39 does not collapse, and the joint lifting of the preform main body portion 32 is reliably suppressed, and the shape of the preform 30 is not collapsed, so that the core mold can be lifted quickly. time to mention.

(molded product)

According to each of the above-mentioned embodiments, it is possible to bring up the timing of the core mold early, so it is considered that the injection stretch blow molding machine having the structure of this embodiment can realize high-cycle container molding (shortening of the molding cycle). Here, in the injection stretch blow molding machine of the above-mentioned structure, the timing of lifting the core mold can be accelerated, and the injection cooling time (high temperature release) can be shortened compared with the conventional method, so it is possible to shorten the injection cooling time and perform molding. The molded product was taken out, and a test for measuring the transparency of the molded product was carried out. As a result of this test, it was found that, as described below, molded products (thick-walled PET containers) with improved transparency can be molded by shortening the injection cooling time with the injection stretch blow molding machine of the above-mentioned structure.

In the conventional injection stretch blow molding machine, it is known that when the injection cooling time at the injection molding part (corresponding to the above-mentioned injection molding part of the embodiment) is long, the time from the stretch blow molding part ( In the case where the stretching start time of the above-mentioned stretch blow molding part corresponding to the example) is longer, the transparency of the molded product is lowered, and the longer the injection cooling time is, and the longer the stretching start time is, the lower the The more crystallized part increases.

In addition, blow molding in which the stretching start time is delayed relative to the preform (when the time from setting the preform in the blow molding mold to being blown is lengthened) means that the time to wait for the state of the high-temperature preform is shortened. Therefore, the preform at the stretch blow molding part is crystallized, and the stage of the preform in the stretch blow molding part becomes white, and if the preform is blow molded, a relatively white and turbid Formed products.

On the other hand, by making the injection cooling time as short as possible while releasing the mold, the injection molding part of the injection stretch blow molding machine with the above-mentioned structure of the embodiment can mold a molten material with very little crystallization. The preform is immediately blow-molded by the stretch blow molding part of the injection stretch blow molding machine of the above-mentioned structure of the embodiment, whereby the preform is molded into a container, and the shaped part set is thinner By stretching, it is possible to obtain a molded article having very few crystallized parts by rapid cooling.

(Measurement of Transparency of Molded Articles)

As a molded article for measurement, a preform with a wall thickness of 7.5 mm was molded using polyethylene terephthalate resin as a material, and a container A having a shape shown in FIG. 11 was molded. In the shape of the container A, the planar shape of the main body of the container is oval, the longest wide part has a width of 50 mm, and the height of the container is 95 mm. The thickness of the shaped portion such as the main body of the container is 1.6 to 2.1 mm. And the main body part of the obtained container was made into the measurement site of transparency.

The molded product (container A) used for the measurement was using the injection stretch blow molding machine of the above-mentioned structure in the example, and the injection time at the injection molding part, the cooling time, and the stretching start time at the blow molding part were changed. Under 10 molding conditions, 5 samples were molded under each molding condition, and these were used as samples for measurement of transparency. (n=5)

When molding using the injection stretch blow molding machine of the above-mentioned structure of the example, as shown in Table 2, the rough classification of the molding conditions is as shown in Table 2. There are 11.5 seconds, 21.0 seconds, and 4 types of 31.0 seconds and 41.0 seconds. In addition, as shown in Table 2, it was previously recognized that there were cases of shape defects in molded products with regard to molding conditions (3) and (4), so the stretching start time was changed as in 6 under molding conditions (2). Slow molding conditions were also set as shown in Table 3. Thus, five molded products (sample containers) were molded under the ten molding conditions as described above. In addition, Table 2 and Table 3 also show the shape state and transparency of the molded product at each molding condition.

[Table 1]

(Forming conditions) 10 conditions

Marking of forming conditions Injection time (seconds) Cooldown (seconds) Total injection cooling time (seconds) Stretch start time (seconds) Period (seconds) 1 (1) 6.5 5.0 11.5 0 14.7 2 (2) 11.5 9.5 21.0 0 24.2 3 (3) 17.0 14.0 31.0 2.0 34.2 4 (4) 22.5 18.5 41.0 2.0 44.2 5 (2)-2 11.5 9.5 21.0 2.0 24.2 6 (2)-4 11.5 9.5 21.0 4.0 24.2 7 (2)-6 11.5 9.5 21.0 6.0 24.2 8 (2)-10 11.5 9.5 21.0 10.0 24.2 9 (2)-15 11.5 9.5 21.0 15.0 24.2 10 (2) -20 11.5 9.5 21.0 20.0 24.2

[Table 2]

(Different injection cooling time) 4 types

Forming conditions (1) Forming conditions (2) Forming conditions (3) Forming conditions (4) Injection cooling time (seconds) 11.5 21.0 31.0 41.0 Injection time (seconds) 6.5 11.5 17.0 22.5 Cooldown (seconds) 5.0 9.5 14.0 18.5 Period (seconds) 14.7 24.2 34.2 44.2 Stretch start time (seconds) 0 0 2.0 2.0 State of the prefab good good good good Condition of molded product (container) good good slightly out of shape bad shape Transparency of molded products (containers) Transparent Transparent Transparent Transparent

[table 3]

(Change in transparency of molded product when stretching start time is delayed by molding condition (2)) 6 types

Forming conditions (2)-2 Forming conditions (2)-4 Forming conditions (2)-6 Forming conditions (2) -10 Forming conditions (2)-15 Forming condition (2) -20 Total injection cooling time (seconds) 21.0 21.0 21.0 21.0 21.0 21.0 Injection time (seconds) 11.5 11.5 11.5 11.5 11.5 11.5 Cooldown (seconds) 9.5 9.5 9.5 9.5 9.5 9.5 Period (seconds) 24.2 24.2 24.2 24.2 24.2 24.2 Stretch start time (seconds) 2.0 4.0 6.0 10.0 15.0 20.0 transparency Transparent Transparent Transparent Transparent Decreased transparency Decreased transparency

(test)

Transparency was obtained as haze (Haze), and the test method for measuring the value of haze is as follows.

・Test specification: According to JIS K7136 (turbidity); 2000

・Testing device: Haze Converter Tester HM-150 (manufactured by Murakami Color Technology Laboratory Co., Ltd.)

・Light source: D65

・Number of tests (number of samples): n=5

・Irradiated surface: From the outside

・Test environment: 23°C 50%RH (RH: relative humidity).

[Table 4]

(Note) The 10 molding condition symbols of the samples (containers) are indicated in conjunction with the symbols of the molding conditions shown in Table 1.

If the above-mentioned molded product is molded by an injection stretch blow molding machine of a conventional structure, the injection cooling time (total time) is 42 seconds. The stretch blow molding machine molds the molded product.

The smaller the value of the turbidity of the sample, the higher the transparency. Based on the comparison with the molding condition (4) corresponding to the conventional manufacturing method, it can be seen from the above Table 4 that if the injection cooling time is shortened in the molding of the injection stretch blow molding machine with the above-mentioned structure based on the embodiment, that is, if the core When the timing of the lifting of the mold is released at high temperature, the transparency of the molded product will be improved.

Furthermore, as shown in Table 1, it can be seen that the injection cooling time can be shortened in the molding of the injection stretch blow molding machine of the above structure, but it is extremely effective in shortening the molding cycle and improving the molding efficiency.

Explanation of reference signs

1…Injection stretch blow molding machine

2…Injection molding department

3…Stretch blow molding department

4... Take out part

5...Rotating plate part

6…lip mold

7…rotating plate

8...cavity mold

9...mandrel

10...Injection molding mold

12...stretch blow mold

18…preform forming space

18a...The center line of the preform forming space

19... Preform mouth forming part

19a...The upper end position of the mouth portion forming part of the preform

20...Preform body part forming part

21...Preform bottom forming part

22...Inner surface forming part of the preform mouth of the core mold

23...Inner surface forming part of the preform body part of the core mold

24...Inner surface forming part of preform bottom of mandrel

25...Enlarged diameter part

26...The outer peripheral surface of the core mold of the enlarged diameter part

27...The outer peripheral surface of the core mold of the inner surface forming part of the main body part of the preform

30…Prefabricated

31...The mouth of the preform

32…Preform body part

33…prefabricated bottom

34… Epidermis

35…middle layer

39…stress relieving face

41...the upper end surface of the preform mouth 31

43 ... cylindrical part.

Claims (13)

1. a kind of injection moulding mould of injection drawing blow molding machine, said injector drawing blow molding machine is, every in swivel plate The secondary lower section for stopping the rotation plate portion so as to lifting with the rotation of the constant anglec of rotation, around the Pivot axle of foregoing swivel plate It is provided with injection moulding portion, draw blow molding portion, taking-up portion, foregoing swivel plate has lip mould in lower surface, and foregoing lip mould is simultaneous Outer peripheral face shaping and prefabrication for prefabrication oral area are carried, and each swivel plate declines, and foregoing lip mould and injection moulding portion, are drawn Stretch blow molding portion, taking-up portion correspondingly,

Chamber mould and core are configured with said injector forming section, foregoing core is lifted in a manner of it can enter in the chamber mould, It is arranged to enter by positioned at the foregoing lip mould of position corresponding with the injection moulding portion, aforementioned cavities mould, through lip mould To the core of chamber mould, injection moulding mould is formed, the injection moulding mould of said injector drawing blow molding machine is characterised by,

Injection moulding mould has the prefabrication surrounded by lip mould, chamber mould, core to form space,

Foregoing prefabrication forms space by prefabrication oral area forming portion, prefabrication main part forming portion, prefabrication bottom forming portion Form, foregoing prefabrication main part forming portion and foregoing prefabrication oral area forming portion are continuous, and gap width is configured to consistent, preceding It is wide to state the gap width of the foregoing prefabrication oral area forming portion of gap width ratio, foregoing prefabrication bottom forming portion and foregoing prefabrication Main part forming portion is continuous, and lower end is cast gate side,

Foregoing core mold is in prefabrication oral area inner surface forming portion, prefabrication main part inner surface forming portion, prefabrication bottom Surface forming portion, and possess wide diameter portion, foregoing prefabrication oral area inner surface forming portion and foregoing prefabrication oral area forming portion pair Should, foregoing prefabrication main part inner surface forming portion is corresponding with foregoing prefabrication main part forming portion, in foregoing prefabrication bottom Surface forming portion is corresponding with foregoing prefabrication bottom forming portion, and foregoing wide diameter portion is from foregoing prefabrication main part inner surface forming portion It is throughout extremely foregoing prefabrication oral area inner surface forming portion that core diameter is gradually expanding,

The core outer peripheral face of foregoing wide diameter portion is in, with foregoing prefabrication main part inner surface forming portion along core outer peripheral face Outward-dipping taper is compared in the position of the extended line of side upward,

The core outer peripheral face of the wide diameter portion is continuously formed from prefabrication main part inner surface forming portion to prefabrication oral area inner surface The part relative with lip mould in portion.

2. the injection moulding mould of injection drawing blow molding machine as claimed in claim 1, it is characterised in that

The core outer peripheral face of above-mentioned wide diameter portion, with the extended line of the side upward along core outer peripheral face of the wide diameter portion with it is upper The mode for stating the upper end position intersection of prefabrication oral area forming portion tilts.

3. the injection moulding mould of injection drawing blow molding machine as claimed in claim 1 or 2, it is characterised in that

Above-mentioned wide diameter portion is configured to, from the part relative with above-mentioned chamber mould of above-mentioned prefabrication main part inner surface forming portion, Via above-mentioned chamber mould and the height and position of the parting line of above-mentioned lip mould, throughout to above-mentioned prefabrication oral area inner surface forming portion with The relative part of above-mentioned lip mould.

4. the injection moulding mould of injection drawing blow molding machine as claimed any one in claims 1 to 3, it is characterised in that

Between above-mentioned prefabrication main part forming portion and above-mentioned prefabrication bottom forming portion, the tubular of undergauge downwards is provided with Portion,

Foregoing cylindrical portion is that the tangent line towards above-below direction lower side of the cylindrical portion is formed relative to foregoing prefabrication main part The extended line of the side downward in portion, the taper of the centerline dip in space is formed to above-mentioned prefabrication.

5. a kind of manufacturing process of prefabrication,

To the injection moulding mould injecting resin of the injection drawing blow molding machine of any one of Claims 1-4, by due to The contact of injection moulding mould and the cooling carried out, shape on the top layer for being filled in above-mentioned prefabrication and forming the resin in space The prefabrication of state formed with the low epidermis of the middle level temperature for the resin being filled than this and mold, above-mentioned lip mould keep be in The prefabrication of the foregoing epidermis state lower than middle level temperature, is removed from above-mentioned injection moulding portion to above-mentioned draw blow molding portion Fortune, it is characterised in that

At the resin being filled corresponding part corresponding with the wide diameter portion of above-mentioned core, the scattered face of stress is formed, it is foregoing It is to be contacted with foregoing wide diameter portion and the epidermis lower than middle level temperature is expanding into taper upward that stress, which disperses face,.

6. the manufacturing process of prefabrication as claimed in claim 5, it is characterised in that

The prefabrication main part forming portion of the core side in space is formed from above-mentioned prefabrication throughout the prefabrication oral area to core side Forming portion, it is formed continuously the scattered face of above-mentioned stress.

7. the manufacturing process of the prefabrication as described in claim 5 or 6, it is characterised in that

The scattered face of above-mentioned stress suppresses to be filled in the resin of prefabrication main part forming portion with rising due to die sinking Core is moved upward.

8. a kind of prefabrication, foregoing prefabrication is made up of prefabrication oral area, prefabrication main part, prefabrication bottom, foregoing prefabricated Product are with the end, and foregoing prefabrication main part and the prefabrication oral area are continuous, and heavy wall is in a ratio of with prefabrication oral area, foregoing prefabricated Product bottom and the prefabrication main part are continuous, and foregoing prefabrication is that the epidermis on top layer is lower than middle level temperature, prefabrication main part With prefabrication bottom can out of prefabrication bulging deforms on the outside of lateral prefabrication, foregoing prefabrication is characterised by,

Inner surface from foregoing prefabrication main part is throughout the epidermis of the inner surface to prefabrication oral area, relative to prefabrication The taper that the outward-dipping ground of extended line upward of the epidermis of the inner surface of main part is opened.

A kind of 9. manufacturing process of container, it is characterised in that

Container is shaped by injection drawing blow molding machine,

Said injector drawing blow molding machine is to stop the rotation plate portion so as to lift every time with the constant anglec of rotation in swivel plate Lower section, the Pivot axle of foregoing swivel plate is provided with injection moulding portion, draw blow molding portion, taking-up portion, foregoing rotation Flap has lip mould in lower surface, and foregoing lip mould is used for the outer peripheral face shaping of prefabrication oral area and prefabrication is carried, rotation every time Flap declines, and foregoing lip mould is corresponding with injection moulding portion, draw blow molding portion, taking-up portion,

Chamber mould and core are configured with said injector forming section, foregoing core is lifted in a manner of it can enter in the chamber mould, It is arranged to enter by positioned at the foregoing lip mould of position corresponding with the injection moulding portion, aforementioned cavities mould, through lip mould To the core of chamber mould, injection moulding mould is formed,

Blow molding die, stretch rod, blow gas feed mechanism are configured with foregoing draw blow molding portion, foregoing stretch rod enters Extended in the blow molding die, foregoing blow gas feed mechanism, can be by position to being sent into blow gas in foregoing blow molding die Blow molding die is entered in the lip mould of position corresponding with the draw blow molding portion, foregoing blow molding die, through foregoing lip mould Foregoing stretch rod, foregoing blow gas feed mechanism form blow molding mould,

In foregoing taking-up portion, accepted in the formed products formed below of the foregoing lip mould positioned at position corresponding with the taking-up portion Mouthful, the manufacturing process of aforesaid receptacle is characterised by,

There is said injector finishing die the prefabrication surrounded by lip mould, chamber mould, core to form space,

Foregoing prefabrication forms space by prefabrication oral area forming portion, prefabrication main part forming portion, prefabrication bottom forming portion Form, foregoing prefabrication main part forming portion and foregoing prefabrication oral area forming portion are continuous, and gap width is configured to consistent, preceding It is wide to state the gap width of the foregoing prefabrication oral area forming portion of gap width ratio, foregoing prefabrication bottom forming portion and foregoing prefabrication Main part forming portion is continuous, and lower end is cast gate side,

Foregoing core mold is in prefabrication oral area inner surface forming portion, prefabrication main part inner surface forming portion, prefabrication bottom Surface forming portion, and possess wide diameter portion, foregoing prefabrication oral area inner surface forming portion and foregoing prefabrication oral area forming portion pair Should, foregoing prefabrication main part inner surface forming portion is corresponding with foregoing prefabrication main part forming portion, in foregoing prefabrication bottom Surface forming portion is corresponding with foregoing prefabrication bottom forming portion, and foregoing wide diameter portion is from foregoing prefabrication main part inner surface forming portion It is throughout extremely foregoing prefabrication oral area inner surface forming portion that core diameter is gradually expanding,

The core outer peripheral face of foregoing wide diameter portion is in, with foregoing prefabrication main part inner surface forming portion along core outer peripheral face Outward-dipping taper is compared in the position of the extended line of side upward,

The core outer peripheral face of the wide diameter portion is continuously formed from prefabrication main part inner surface forming portion to prefabrication oral area inner surface The part relative with lip mould in portion,

To said injector finishing die injecting resin, it is in by because the contact with injection moulding mould is and the cooling that carries out, shaping It is low in middle level temperature of the top layer formed with the resin being filled than this for being filled in the resin that foregoing prefabrication forms space The prefabrication of the state of epidermis and mold, foregoing lip mould is kept in the prefabricated of the foregoing epidermis state lower than middle level temperature Product, carried from foregoing injection moulding portion to foregoing draw blow molding portion,

To be kept by foregoing lip mould and be carried to the prefabrication in draw blow molding portion by foregoing blow molding contour forming into Container,

Foregoing lip mould keeps the aforesaid receptacle being formed out, is carried from draw blow molding portion to taking-up portion,

Kept by foregoing lip mould and be carried to the container in taking-up portion and foregoing formed products birdsmouth to it is corresponding when releasing lip mould phase For the hold mode of container.

10. the forming method of container as claimed in claim 9, it is characterised in that

The core outer peripheral face of the above-mentioned wide diameter portion of core is with the extension of the side upward along core outer peripheral face of the wide diameter portion The mode that line and the upper end position of above-mentioned prefabrication oral area forming portion intersect tilts.

11. the forming method of the container as described in claim 9 or 10, it is characterised in that

The above-mentioned wide diameter portion of core is configured to, from the relative with above-mentioned chamber mould of above-mentioned prefabrication main part inner surface forming portion Part, via above-mentioned chamber mould and the height and position of the parting line of above-mentioned lip mould, formed throughout to above-mentioned prefabrication oral area inner surface The part relative with above-mentioned lip mould in portion.

12. the forming method of the container as any one of claim 9 to 11, it is characterised in that

Between the above-mentioned prefabrication main part forming portion and above-mentioned prefabrication bottom forming portion of injection moulding mould, it is provided with downwards The cylindrical portion of square undergauge,

Foregoing cylindrical portion is that the tangent line towards above-below direction lower side of the cylindrical portion is formed relative to foregoing prefabrication main part The extended line of the side downward in portion, the taper of the centerline dip in space is formed to above-mentioned prefabrication.

A kind of 13. container, it is characterised in that

It is the container obtained as the manufacturing process of the container any one of claim 9 to 12.